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chromium/third_party/blink/web_tests/svg/as-image/resources/actually-xhtml-with-media.svg 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
    <video src="data:"></video>
</body>
</html>